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Method for preparing quicklime by continuously calcining limestone in shaft kiln

A technology for calcining limestone and quicklime, applied in lime production and other directions, can solve the problems of difficult to guarantee product quality, high production cost, unstable operating conditions, etc., and achieve the effects of improving product quality, saving fossil fuels and lowering production costs.

Inactive Publication Date: 2012-12-12
张金永
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High raw material coal consumption, low thermal efficiency, waste of energy, and environmental pollution; cumbersome operation, unstable operating conditions, high labor intensity; over-burning and under-burning occur from time to time, product quality is difficult to guarantee, and production costs remain high

Method used

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  • Method for preparing quicklime by continuously calcining limestone in shaft kiln
  • Method for preparing quicklime by continuously calcining limestone in shaft kiln
  • Method for preparing quicklime by continuously calcining limestone in shaft kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The quicklime product of the present invention is prepared according to the following methods and steps

[0042] Equipped with a computer centralized control system, through the preset program, the following operations are realized:

[0043] ①. The gas flow and pressure of the furnace bottom combustion air blast and the furnace top exhaust air are automatically controlled, and the continuous calcination is performed;

[0044] ②. Periodic intermittent automatic discharge of calcined qualified product quicklime

[0045] ③. The raw material limestone and fuel coal shall be mixed uniformly according to the proposed ratio, synchronized with the discharged products, and automatically replenished periodically and intermittently;

[0046] It includes the following steps:

[0047] a. Original driving

[0048] Qualified raw material limestone and fuel coal are automatically measured, conveyed and fed to the set height, ignited, and calcined until the quicklime product is quali...

Embodiment 2

[0055] Prepare the quicklime product of the present invention according to the method and steps of Example 1

[0056] Other technical indicators are as follows:

[0057]

[0058]

[0059] The thermal efficiency of fuel coal is 90%. Product Quicklime Quality Index CaO≥94%, MgO≤3%, SiO 2 ≤1.5%, reduced by ≤10%. 115 kg of fuel coal is consumed per ton of product quicklime.

Embodiment 3

[0061] Prepare the quicklime product of the present invention according to the method and steps of Example 1

[0062] Other technical indicators are as follows:

[0063]

[0064] The thermal efficiency of fuel coal is 85%. Product Quicklime Quality Index CaO≥90%, MgO≤4%, SiO 2 ≤2%, reduce ≤10%. Each ton of product quicklime consumes 120 kilograms of fuel coal.

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Abstract

The invention relates to a method for preparing quicklime by continuously calcining limestone in a shaft kiln, belonging to a method for preparing quicklime by calcining limestone in a shaft kiln. The method is provided with a computer centralized control system, and implements the following steps according to a preset program: (1) while automatically controlling gas flow and pressure of kiln bottom combustion-supporting blast air and kiln top exhaust induced air, continuously calcining; (2) automatically discharging qualified calcining product quicklime in a periodical and discontinuous way; and (3) evenly mixing the raw material limestone and fuel coal according to a preset ratio, and automatically supplementing synchronous with the discharged product in a periodical and discontinuous way. The method provided by the invention has the advantages of high raw material coal heat efficiency, low consumption, stable operating conditions and low production cost. The heat efficiency of the fuel coal is greater than or equal to 80%. The heat utilization ratio is enhanced by more than 20% as compared with the prior art. The quality indexes the product quicklime are as follows: CaO>=94%, MgO<=3%, SiO2<=2%, and discretionary reduction<=10%. The consumption of the raw material coal is lowered, i.e. every ton of product quicklime consumes 115-120kg of fuel coal.

Description

technical field [0001] The invention relates to a method for preparing quicklime by continuously calcining limestone in a shaft kiln. The invention belongs to a method for preparing quicklime by calcining limestone in a shaft kiln. Background technique [0002] In the prior art, the method for preparing quicklime is a single shaft kiln discontinuous calcination method. Every time a furnace of quicklime is produced, it must go through the steps of loading the kiln - calcining - leaving the kiln. The raw coal consumption is high, the thermal efficiency is low, the energy is wasted, and the environment is polluted; the operation is cumbersome, the operating conditions are unstable, and the labor intensity is high; over-burning and under-burning occur from time to time, the product quality is difficult to guarantee, and the production cost remains high. SUMMARY OF THE INVENTION [0003] The object of the present invention is to avoid the deficiencies in the above-mentioned p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/12
CPCY02P40/40
Inventor 张金永于加磊
Owner 张金永
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